Manually-guided motor-driven abrading machine



Nov. 30,1926. 1,608,920

C. J. ANDERSON MANUALLY GUIDED MOTOR DRIVEN ABRADING MACHINE Filed Dec. 21 1925 2 Sheets-Sheet 1 m Fig. Z-

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- Nov. 30., 1926.

C. J. ANDERSON MANUALLY GUIDED MOTOR DRIVEN ABRADING momma Filed Dec. 21, 1 2 Sheets-Sheet? CJf/ndmww, 4 0% M1 @A M v Patented Nov. 30, 1926.

UNITED STATES PATENT oFFrcE;

CARL J. ANDERSON, OF CHICAGO, ILLINOIS, .ASSIGNOR, BY DIRECT AND MESNE AS- SIGNMENTS, OF ONE-THIRD TO RICHARD HOLM AND ONE-THIRD TO ERIK BORG,

BOTH OIE' CHICAGO, ILLINOIS.

' MANUALLY-GUIDED MOTOR-DRIVEN aimanme MACHINE.

Application filed December 21, 1925. Serial No. 76,578.

4 The embodiment lierein shown of the invention is in the form of an implement especially designed for use in abrading the upper surface of butchers blocks for the 5 purpose of producing a smooth, clean surface t-hereon. 'Among the salient objects of the invention as applied to such use are, to attain a high degree of convenience inoperation, to provide an adjustable mounting for the rotary abrading element to compensate for wear, and to. provide resilient means for lifting the apparatus so as to remove the abrading element from contact with the surface upon which the apparatus rests when the operator releases the apparatus.

The invention may also be embodied in apparatus especially adapted for use in abrading r polishing floors and the like.

In the accompanying drawings, Figure 1 is a side view of an apparatus embodylng the features of my invention with certain parts broken away.

Fig. 2 is a plan view with the slde cover plate in section to disclose a certain gear train.

Fig. 3 is a sectional view taken in the plane indicated by dotted line 3-3 of Fig. 4 and dotted line 33 of Fig. 2.

Fig. 4 is a section on line 4-4 of Fig. 3.

Figs. 5 and 6 are detail views. of certain parts comprised in the rotary abrading element.

In the drawings, A denotes a butchers block or the like which is to be resurfaced.

The apparatus comprises a casing 1 which may be a casting, said casing being provided with a hand-hold 2 at its forward end and a handle 3 at its rear end. The forward end of the casing 1 is adapted to rest upon the surface to be treated. The .rear end of the casing is supported by resilient means consisting of a relatively wide roller 4, the ends.

of which are journaled in plungers 5, only one of which is shown in the present drawings. Each plunger is mounted in a vertically extending recess 6 in the rear end of the casing 1 and is urged downwardly by a coiled expansive spring 7 mounted within said recess, as shown in Fig. 1. The. extent 0 of movement of the plunger 5 under the action of the spring 7 is limited by contact of a nut 8 on the upper end of said plunger with a stop surface 9.

The abrading element may be described as a rotary brush and is designated by the reference number 10 (Figs. 3 and 4). Said brush preferably consists of a multiplicity 4 of circumferential series of spring steel members 11 radiating from a central shaft 12. Surrounding the shaft 12 and secured thereto by means of. set screws 13 is a sleeve 14. Each spring-steel brush element 11 is of V-shape and is secured to the sleeve 14 by means including pins 15 which lie within the angles of the V-shaped brush elements and extend through holes 16 formed in washers 17 (Fig. 5) which fit upon the sleeve 14 and alternate with the circumferential series of brush elements. The washers 17 and the brush elements held therebtween are clamped together by means of two end locking washers 18 (Fig. 6) having noncircularapertures 19 to correspond with the form of the ends of the sleeve 14. The locking washers 18 are drawn'together by .means of tie rods 20 and nuts 21 on the ends of said tie rods. As shown in Fig. 5

the washers 17 are notched as at'22 to ac- .ings 23 carried by the ends of a yoke 24 which is pivotally supported within the casing 1 by means of a shaft 25. The yoke 24 is provided with a gear segment 26 adapted to mesh with a pinion 27 which is fixed u on a shaft journaled in the upper part- 0? the casing 1. Upon one end of the shaft .28 outside of the casing is a knurled knob 29 by means of WhlCh'1he pinion 27 may be manually rotated to swing the yoke 24 to I compensate for wear of the ends of the springs 11, and to cause the brush to project to a greater or less extent from the open lower side of the casing 1. 30 is a clam ing nut on one end of the shaftv28 whic may be tightened up to lock the yoke 24 in adjusted position.

The means for rotating the brush in the direction shown by the arrow in Fig. 3 comprises an electric motor 31 located within a compartment 1 in the forward part of the casing 1 and separated from that part of the casing which contains the segment 24 and the brush 10 by means of a partition 32. In one side Wall of the compartment 1 is an opening for the introduction of the .Lmotor, said opening being close-d by a plate 1 which also forms part of the means for supporting the motor. On one end of the motor shaft is a pinion 33 (Fig. 2) meshing with a spur gear wheel 34 which is mounted to rotate upon the axis of the shaft 25. Rigid with the gear wheel 34 is a pinion 35 that meshes with an idler or intermediate gear 36 which in turn meshes with a pinion 37 which is rigidly secured to one end of the brush shaft 12. The gear train just described is" located outside the main casing 1 and is enclosed by a'cover plate 38 detachably secured to one side of the main casing 1. The gear wheel 36 is mounted on a stud 39 (Fig. 3) which is carried by the yoke 24 and projects through an arc-shaped slot '40 in one side of the main casing 1.

Electric current is conveyed to the motor 31 in any preferred manner, as for example, by means of an electric cord (not shown) having a plug adapted to fit in the receptacle 41 (Fig. 2) carried by the main casing 1. 42 indicates a switch for controlling the supply of current to the motor.

' means of a spring arm 47 secured within the brush chamber in any preferred manner. The spring arm 47 has a V-shaped portion 48 into which the upper edge of the end wall of the dust receptacle is adapted to snap when the operator swings the dust receptacle down against the tension of the spring 47 to dump the contents of the receptacle. The spring arm 47 thus serves to hold the dust receptacle in dumping position. Vhen the receptacle is pushed back to normal position the spring arm 47 serves to secure it in such position.

In use, the operator bears down on the handle 3 sufficiently to bring the rapidly revolving brush into contact with the work. The operator pushes the apparatus back and forth over the surface to be treated, the rapidly rotating springs 11 serving to abrade the surface. As will be evident from the drawings, the casing 1, the sum 7 central support, a

erator releases the apparatus without first stopping the motor.

The metallic brush or abrading element herein shown is well adapted for abrading or surfacing floors and the like. Hence I would have it understood that the claims hereinafter set forth in regard to the brush are not to be limited to an apparatus for resurfacing butchers blocks.

I claim as my invention:

1. A rotary abrading element comprising a central support, a plurality of circumferential series of V-shaped springs, the free ends of the arms of each spring bearing against the arms of the adjacent springs, and means for securing the springs to the central support comprising pins extending parallel with the central support and lying within the angles of the V-shaped springs, spacing washers surrounding the central support and alternating with the circumferential series of springs, said pins extending through said washers, two end lockin washers at opposite ends of the series of springs and spacing washers, and tie rods for drawing the locking washers together. to clamp the springs and the spacing washers together.

2. A rotary abrading element comprising a lurality of circumferential series of V-s aped springs, the free ends of the arms of each spring bearing against the arms of the adjacent springs, and means for securing the springs to the central support comprising pins extending parallel with the central support and lying within the angles of the V-shaped springs, spacing washers surrounding the central support and alternating with the circumferential series of springs, said pins extending through said washers, and means to clamp the springs and the spacing washers together.

3. A rota'ry abrading element comprising a central support, a circumferential -series of V-shaped springs, the free ends of the arms of each spring bearing against the arms of the adjacent spring, and means for securing the springs to the central support comprising pins extending parallel with the central support and lying within the angles (-f the V shaped springs, and means to secure the pins to the central support.

4. A rotary. abrading element comprising a central support and a circumferential series of V-shaped springs connected ad jacent to the angles of the springs to said central support, the. free ends of the arms of each spring bearing against the arms of the adjacent springs whereby each spring supports the adjacent spring and cooperates Wit them to restore the springs to substantially radial position after the springs have been flexed through contact wi h the work.

5. A manually-guided motor-driven abrading machine comprising, in combination, a casing adapted to slide upon a surface to be abraded; said casing having a forward motor compartment and a rear brush compartment, an electric motor in saidmotor compartment, a pivoted support within the vbrush compartment, a rotary brush carried mounted coaxially with the pivot of said support, a handle on the casing adjacent to the brush and a resilient support for said v casing adjacent to the brush for lifting the casing sufficiently to remove the brush from contact with the sustaining surface when the operator relieves the pressure upon the handle.

In testimony whereof, I have hereunto afiixed my signature;

CARL J. ANDERSON. 

